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Full Discussion: Grep with wildcard
Top Forums Shell Programming and Scripting Grep with wildcard Post 303036357 by abdossamad2003 on Monday 24th of June 2019 06:10:55 AM
Old 06-24-2019
wildcard in grep
Quote:
Originally Posted by Corona688
grep uses regexes, not globs, with slightly different meanings. In glob, * means 'zero or more characters', in regex, it means 'zero or more of the previous character'.

So something* in regex terms would match something, somethingg, somethingggggggggggggggggggggg, somethin, but not somethina.

In regex, ? means "zero or one of the previous character" while . means "any character". You can combine the two as .? to mean "zero or one of any character" for example.

So try grep 'sample.txt' to match sampleatxt, samplebtxt, samplectxt, etc.



"grep uses regexes, not globs" is this mean extended regular expression is used by grep?
and globs means basin regular expression?


many thanks
samad

--- Post updated at 05:52 AM ---

Quote:
Originally Posted by Corona688
grep uses regexes, not globs, with slightly different meanings. In glob, * means 'zero or more characters', in regex, it means 'zero or more of the previous character'.

So something* in regex terms would match something, somethingg, somethingggggggggggggggggggggg, somethin, but not somethina.

In regex, ? means "zero or one of the previous character" while . means "any character". You can combine the two as .? to mean "zero or one of any character" for example.

So try grep 'sample.txt' to match sampleatxt, samplebtxt, samplectxt, etc.

but something* match "somethinga" that a in somethinga isn't previous character!

--- Post updated at 06:10 AM ---

Quote:
Originally Posted by Corona688
grep uses regexes, not globs, with slightly different meanings. In glob, * means 'zero or more characters', in regex, it means 'zero or more of the previous character'.

So something* in regex terms would match something, somethingg, somethingggggggggggggggggggggg, somethin, but not somethina.

In regex, ? means "zero or one of the previous character" while . means "any character". You can combine the two as .? to mean "zero or one of any character" for example.

So try grep 'sample.txt' to match sampleatxt, samplebtxt, samplectxt, etc.



you say " but not somethina" this is incorrect because the something* match somethina.


Code:
[samad@localhost test]$ grep "something*" test 
somethina

 

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